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.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    14061, 14052, 14095, 14086, 14078, 14077, 
    14076, 14117, 14116, 14055, 14054, 
    14111, 14110, 14085, 14109, 14084, 
    14075, 14083, 14060, 14059, 14101, 
    14100, 14127, 14126
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.04252208,
    "nested_loop": [
      {
        "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"],
          "loops": 1,
          "rows": 24,
          "cost": 0.04252208,
          "filtered": 100,
          "attached_condition": "cscart_product_descriptions.product_id in (14061,14052,14095,14086,14078,14077,14076,14117,14116,14055,14054,14111,14110,14085,14109,14084,14075,14083,14060,14059,14101,14100,14127,14126) and cscart_product_descriptions.lang_code = 'en'"
        }
      }
    ]
  }
}