SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  products.amount, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  variation_group_products.group_id AS variation_group_id, 
  products.product_type, 
  products.parent_product_id, 
  cp_variation_group_products.position as variation_position 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_ult_product_descriptions shared_descr ON shared_descr.product_id = products.product_id 
  AND shared_descr.company_id = 1 
  AND shared_descr.lang_code = 'en' 
  INNER JOIN cscart_product_variation_group_products AS variation_group_products ON variation_group_products.product_id = products.product_id 
  LEFT JOIN cscart_product_variation_group_products AS cp_variation_group_products ON cp_variation_group_products.product_id = products.product_id 
WHERE 
  1 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND (
    products.status IN ('A') 
    OR (
      products.status IN ('A', 'H') 
      AND descr1.product LIKE '%Free%'
    )
  ) 
  AND variation_group_products.group_id IN (51, 49, 58) 
GROUP BY 
  products.product_id 
ORDER BY 
  variation_position asc, 
  products.product_id ASC

Query time 0.00892

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "cp_variation_group_products.position, products.product_id",
      "temporary_table": {
        "table": {
          "table_name": "companies",
          "access_type": "system",
          "possible_keys": ["PRIMARY"],
          "rows": 1,
          "filtered": 100
        },
        "table": {
          "table_name": "variation_group_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "idx_group_id"],
          "key": "idx_group_id",
          "key_length": "3",
          "used_key_parts": ["group_id"],
          "rows": 26,
          "filtered": 100,
          "index_condition": "variation_group_products.group_id in (51,49,58)"
        },
        "table": {
          "table_name": "products",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "status"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["herbaria_cscart_4_18.variation_group_products.product_id"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "products.company_id = 1 and (products.usergroup_ids = '' or find_in_set(0,products.usergroup_ids) or find_in_set(1,products.usergroup_ids)) and (products.`status` = 'A' or products.`status` in ('A','H'))"
        },
        "table": {
          "table_name": "shared_descr",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "product_id", "company_id"],
          "key": "PRIMARY",
          "key_length": "13",
          "used_key_parts": ["product_id", "lang_code", "company_id"],
          "ref": [
            "herbaria_cscart_4_18.variation_group_products.product_id",
            "const",
            "const"
          ],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(shared_descr.lang_code = 'en')"
        },
        "table": {
          "table_name": "cp_variation_group_products",
          "access_type": "ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["herbaria_cscart_4_18.variation_group_products.product_id"],
          "rows": 1,
          "filtered": 100
        },
        "table": {
          "table_name": "descr1",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["product_id", "lang_code"],
          "ref": [
            "herbaria_cscart_4_18.variation_group_products.product_id",
            "const"
          ],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(products.`status` = 'A' or products.`status` in ('A','H') and descr1.product like '%Free%') and trigcond(descr1.lang_code = 'en')"
        },
        "table": {
          "table_name": "products_categories",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "pt"],
          "key": "pt",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["herbaria_cscart_4_18.variation_group_products.product_id"],
          "rows": 4,
          "filtered": 100
        },
        "table": {
          "table_name": "cscart_categories",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "c_status"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["category_id"],
          "ref": ["herbaria_cscart_4_18.products_categories.category_id"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "(cscart_categories.usergroup_ids = '' or find_in_set(0,cscart_categories.usergroup_ids) or find_in_set(1,cscart_categories.usergroup_ids)) and cscart_categories.`status` in ('A','H') and cscart_categories.storefront_id in (0,1)"
        }
      }
    }
  }
}