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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    88464, 88480, 88691, 88738, 87548, 88077, 
    88141, 88144, 88767, 90829, 89574, 
    88939, 89017, 88547, 87986, 87946, 
    88583, 88674, 88721, 87947, 87949, 
    88043, 88582, 90833, 87956, 89982, 
    89983, 89984, 88081, 87620, 87622, 
    84702, 84705, 91052, 88003, 88545, 
    88046, 88080, 88403, 84697, 84698, 
    88028, 88140, 88143, 88508, 88543, 
    88765, 89016
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00108

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (88464,88480,88691,88738,87548,88077,88141,88144,88767,90829,89574,88939,89017,88547,87986,87946,88583,88674,88721,87947,87949,88043,88582,90833,87956,89982,89983,89984,88081,87620,87622,84702,84705,91052,88003,88545,88046,88080,88403,84697,84698,88028,88140,88143,88508,88543,88765,89016)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}