SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    55, 194, 298, 427, 428, 429, 430, 431, 
    506, 518, 519, 5473, 5474, 504, 1843, 
    1841, 1855, 1840, 1853, 486, 1854, 1842
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 22,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (55,194,298,427,428,429,430,431,506,518,519,5473,5474,504,1843,1841,1855,1840,1853,486,1854,1842) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}