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 (
    99178, 99179, 99180, 99182, 99183, 99184, 
    99192, 99193, 99194, 99197, 99198, 
    99199, 99200, 99203, 99204, 99206, 
    99207, 99208, 99209, 99214, 99215, 
    99218, 99219, 99221, 99222, 99223, 
    99224, 99225, 99226, 99227, 99228, 
    99229, 99230, 99231, 99232, 99233, 
    99234, 99235, 99236, 99237, 99238, 
    99240, 99242, 99243, 99244, 99245, 
    99246, 99247
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00081

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 (99178,99179,99180,99182,99183,99184,99192,99193,99194,99197,99198,99199,99200,99203,99204,99206,99207,99208,99209,99214,99215,99218,99219,99221,99222,99223,99224,99225,99226,99227,99228,99229,99230,99231,99232,99233,99234,99235,99236,99237,99238,99240,99242,99243,99244,99245,99246,99247)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}