SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    13032, 13033, 13034, 13035, 13036, 13037, 
    13038, 13039, 13040, 13041, 13042, 
    13043, 13044, 12943, 12944, 12945, 
    12951, 12953, 12950, 12952
  ) 
  AND cscart_product_descriptions.lang_code = 'kk'

Query time 0.00072

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (13032,13033,13034,13035,13036,13037,13038,13039,13040,13041,13042,13043,13044,12943,12944,12945,12951,12953,12950,12952) and cscart_product_descriptions.lang_code = 'kk'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
12943
12944
12945
12950
12951
12952
12953
13032
13033
13034
13035
13036
13037
13038
13039
13040
13041
13042
13043
13044