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 (
    101239, 101240, 101241, 101242, 101243, 
    101244, 101245, 101246, 101247, 101248, 
    101249, 101250, 101251, 101252, 101253, 
    101254, 101255, 101256, 101257, 101258, 
    101259, 101260, 101261, 101262, 101263, 
    101264, 101265, 101266, 101267, 101268, 
    101269, 101270, 101271, 101272, 101273, 
    101274, 101275, 101276, 101277, 101278, 
    101279, 101280, 101281, 101282, 101283, 
    101284, 101285, 101286, 101287, 101288, 
    101289, 101290, 101291, 101292, 101293, 
    101294, 101295, 101296, 101297, 101298, 
    101299, 101300, 101301, 101302, 101303, 
    101304, 101305, 101306, 101307, 101308, 
    101309, 101310, 101311, 101312, 101313, 
    101314, 101315, 101316, 101317, 101318, 
    101319, 101320, 101321, 101322, 101323, 
    101324, 101325, 101326, 101327, 101328, 
    101329, 101330, 101331, 101332, 101333, 
    101334
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00174

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "54.01"
    },
    "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": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "44.41",
        "eval_cost": "9.60",
        "prefix_cost": "54.01",
        "data_read_per_join": "366K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (101239,101240,101241,101242,101243,101244,101245,101246,101247,101248,101249,101250,101251,101252,101253,101254,101255,101256,101257,101258,101259,101260,101261,101262,101263,101264,101265,101266,101267,101268,101269,101270,101271,101272,101273,101274,101275,101276,101277,101278,101279,101280,101281,101282,101283,101284,101285,101286,101287,101288,101289,101290,101291,101292,101293,101294,101295,101296,101297,101298,101299,101300,101301,101302,101303,101304,101305,101306,101307,101308,101309,101310,101311,101312,101313,101314,101315,101316,101317,101318,101319,101320,101321,101322,101323,101324,101325,101326,101327,101328,101329,101330,101331,101332,101333,101334)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}