SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id 
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_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  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' 
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') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND (
    (
      1 
      AND products.product_id IN (337, 1562, 1563, 1564)
    ) 
    AND companies.status IN ('A') 
    AND prices.usergroup_id IN (0, 0, 1)
  ) 
GROUP BY 
  products.product_id 
ORDER BY 
  NULL asc

Query time 0.00180

JSON explain

{
  "query_block": {
    "select_id": 1,
    "temporary_table": {
      "table": {
        "table_name": "companies",
        "access_type": "system",
        "possible_keys": ["PRIMARY"],
        "rows": 1,
        "filtered": 100
      },
      "table": {
        "table_name": "products",
        "access_type": "range",
        "possible_keys": ["PRIMARY", "status"],
        "key": "PRIMARY",
        "key_length": "3",
        "used_key_parts": ["product_id"],
        "rows": 4,
        "filtered": 75,
        "index_condition": "products.product_id in (337,1562,1563,1564)",
        "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'"
      },
      "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.products.product_id", "const", "const"],
        "rows": 1,
        "filtered": 100,
        "attached_condition": "trigcond(shared_descr.lang_code = 'en')"
      },
      "block-nl-join": {
        "table": {
          "table_name": "prices",
          "access_type": "range",
          "possible_keys": ["product_id"],
          "key": "product_id",
          "key_length": "9",
          "used_key_parts": ["product_id", "lower_limit", "usergroup_id"],
          "rows": 8,
          "filtered": 12.5,
          "using_index": true
        },
        "buffer_type": "flat",
        "buffer_size": "256Kb",
        "join_type": "BNL",
        "attached_condition": "prices.product_id = products.product_id and prices.lower_limit = 1 and prices.usergroup_id in (0,0,1) and prices.usergroup_id in (0,0,1)"
      },
      "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.products.product_id", "const"],
        "rows": 1,
        "filtered": 100,
        "attached_condition": "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.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)"
      }
    }
  }
}