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 (
    99396, 99397, 99398, 100358, 100395, 
    100396, 100397, 100398, 100400, 100401, 
    100402, 100403, 100404, 100405, 100406, 
    100407, 100408, 100409, 100410, 100411, 
    100412, 100413, 100414, 100415, 100416, 
    100417, 100418, 100419, 100420, 100421, 
    100422, 100423, 100424, 100425, 100426, 
    100427, 100428, 100429, 100430, 100477, 
    100478, 100500, 100503, 100849, 100850, 
    100851, 100852, 100857, 100858, 100859, 
    100860, 100861, 100862, 100867, 100868, 
    100869, 100870, 100877, 100878, 101055, 
    101056, 101057, 101058, 101059, 101060, 
    101061, 101062, 101063, 101064, 101065, 
    101066, 101067, 101068, 101069, 101070, 
    101071, 101072, 101073, 101074, 101075, 
    101076, 101077, 101078, 101079, 101080, 
    101081, 101082, 101083, 101084, 101085, 
    101086, 101087, 101088, 101089, 101090, 
    101091
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00172

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.24"
    },
    "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": "33.64",
        "eval_cost": "9.60",
        "prefix_cost": "43.24",
        "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 (99396,99397,99398,100358,100395,100396,100397,100398,100400,100401,100402,100403,100404,100405,100406,100407,100408,100409,100410,100411,100412,100413,100414,100415,100416,100417,100418,100419,100420,100421,100422,100423,100424,100425,100426,100427,100428,100429,100430,100477,100478,100500,100503,100849,100850,100851,100852,100857,100858,100859,100860,100861,100862,100867,100868,100869,100870,100877,100878,101055,101056,101057,101058,101059,101060,101061,101062,101063,101064,101065,101066,101067,101068,101069,101070,101071,101072,101073,101074,101075,101076,101077,101078,101079,101080,101081,101082,101083,101084,101085,101086,101087,101088,101089,101090,101091)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}