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 (
    99807, 99808, 99809, 99810, 99811, 99812, 
    99813, 99814, 99815, 99816, 99817, 
    99818, 99819, 99820, 99821, 99822, 
    99823, 99824, 99825, 99826, 99827, 
    99828, 99829, 99830, 99831, 99835, 
    99836, 99837, 99838, 99885, 99886, 
    99887, 99888, 99889, 99890, 99891, 
    99892, 99919, 99920, 99921, 99922, 
    99923, 99924, 99925, 99926, 99927, 
    99928, 99929, 99930, 99931, 99996, 
    99997, 99998, 99999, 100000, 100001, 
    100002, 100005, 100006, 100007, 100008, 
    100009, 100010, 100011, 100012, 100058, 
    100059, 100060, 100061, 100062, 100063, 
    100064, 100065, 100066, 100073, 100074, 
    100075, 100076, 100077, 100078, 100079, 
    100080, 100081, 100082, 100083, 100084, 
    100085, 100086, 100087, 100088, 100089, 
    100090, 100091, 100092, 100093, 100094
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00169

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 (99807,99808,99809,99810,99811,99812,99813,99814,99815,99816,99817,99818,99819,99820,99821,99822,99823,99824,99825,99826,99827,99828,99829,99830,99831,99835,99836,99837,99838,99885,99886,99887,99888,99889,99890,99891,99892,99919,99920,99921,99922,99923,99924,99925,99926,99927,99928,99929,99930,99931,99996,99997,99998,99999,100000,100001,100002,100005,100006,100007,100008,100009,100010,100011,100012,100058,100059,100060,100061,100062,100063,100064,100065,100066,100073,100074,100075,100076,100077,100078,100079,100080,100081,100082,100083,100084,100085,100086,100087,100088,100089,100090,100091,100092,100093,100094)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}