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 (
    97865, 97866, 97869, 97870, 97873, 97903, 
    97904, 97905, 97906, 97907, 97908, 
    97909, 97910, 97935, 97936, 97937, 
    97938, 97939, 97940, 97941, 97942, 
    97952, 97962, 97963, 97967, 97970, 
    97971, 97972, 97973, 97975, 97978, 
    97979, 97982, 97983, 97986, 97987, 
    98041, 98043, 98045, 98047, 98049, 
    98051, 98084, 98122, 98123, 98124, 
    98125, 98126, 98127, 98128, 98129, 
    98169, 98171, 98172, 98174, 98327, 
    98328, 98329, 98330, 98331, 98332, 
    98333, 98334, 98335, 98336, 98337, 
    98338, 98339, 98340, 98341, 98342, 
    98367, 98368, 98369, 98370, 98371, 
    98372, 98373, 98374, 98375, 98376, 
    98377, 98378, 98379, 98380, 98381, 
    98382, 98418, 98420, 98551, 98571, 
    98683, 98684, 98717, 98719, 98721
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00237

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "52.31"
    },
    "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": "42.71",
        "eval_cost": "9.60",
        "prefix_cost": "52.31",
        "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 (97865,97866,97869,97870,97873,97903,97904,97905,97906,97907,97908,97909,97910,97935,97936,97937,97938,97939,97940,97941,97942,97952,97962,97963,97967,97970,97971,97972,97973,97975,97978,97979,97982,97983,97986,97987,98041,98043,98045,98047,98049,98051,98084,98122,98123,98124,98125,98126,98127,98128,98129,98169,98171,98172,98174,98327,98328,98329,98330,98331,98332,98333,98334,98335,98336,98337,98338,98339,98340,98341,98342,98367,98368,98369,98370,98371,98372,98373,98374,98375,98376,98377,98378,98379,98380,98381,98382,98418,98420,98551,98571,98683,98684,98717,98719,98721)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}