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 (
    90714, 90720, 90713, 90719, 90728, 90729, 
    90717, 90723, 90725, 90727, 90712, 
    90718, 90586, 90587, 90730, 90731, 
    90724, 90726, 90716, 90722, 90592, 
    90593, 89243, 89244, 89253, 89254, 
    90588, 90590, 89245, 89246, 89247, 
    89248, 90589, 90591, 90715, 90721, 
    89249, 89250, 89251, 89252, 90048, 
    90049, 90050, 90051, 90052, 90053, 
    90018, 90019, 90020, 90021, 90032, 
    90033, 90034, 90035, 90036, 90037, 
    90042, 90043, 90044, 90045, 90046, 
    90047, 90058, 90059, 90014, 90015, 
    90016, 90017, 90026, 90027, 90028, 
    90029, 90030, 90031, 87836, 93834, 
    93835, 93882, 93883, 93884, 93885, 
    95360, 96122, 96124, 96125, 96126, 
    96127, 96131, 96155, 96156, 96195, 
    96196, 96197, 96198, 96199, 96200
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00086

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 (90714,90720,90713,90719,90728,90729,90717,90723,90725,90727,90712,90718,90586,90587,90730,90731,90724,90726,90716,90722,90592,90593,89243,89244,89253,89254,90588,90590,89245,89246,89247,89248,90589,90591,90715,90721,89249,89250,89251,89252,90048,90049,90050,90051,90052,90053,90018,90019,90020,90021,90032,90033,90034,90035,90036,90037,90042,90043,90044,90045,90046,90047,90058,90059,90014,90015,90016,90017,90026,90027,90028,90029,90030,90031,87836,93834,93835,93882,93883,93884,93885,95360,96122,96124,96125,96126,96127,96131,96155,96156,96195,96196,96197,96198,96199,96200)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}