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 (
    98737, 98750, 98751, 98752, 98753, 98754, 
    98755, 98756, 98757, 99509, 99510, 
    99513, 99514, 99517, 99518, 99653, 
    99654, 99655, 99656, 99657, 99658, 
    99659, 99660, 99661, 99662, 99663, 
    99664, 99665, 99666, 99667, 99668, 
    100504, 100505, 100506, 100507, 100508, 
    100509, 100510, 100511, 100512, 100513, 
    100514, 100515, 100516, 100517, 100518, 
    100519, 100520, 100521, 100522, 100523, 
    100524, 100525, 100526, 100527, 100528, 
    100529, 100530, 100531, 100532, 100533, 
    100534, 100535, 100642, 100644, 100646, 
    100648, 100789, 100790, 100791, 100792, 
    100793, 100794, 100795, 100796, 100797, 
    100798, 100799, 100800, 100801, 100802, 
    100803, 100804, 100805, 100806, 100807, 
    100808, 100809, 100810, 100811, 100812, 
    100813, 100814, 100815, 100816, 100817
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00151

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 (98737,98750,98751,98752,98753,98754,98755,98756,98757,99509,99510,99513,99514,99517,99518,99653,99654,99655,99656,99657,99658,99659,99660,99661,99662,99663,99664,99665,99666,99667,99668,100504,100505,100506,100507,100508,100509,100510,100511,100512,100513,100514,100515,100516,100517,100518,100519,100520,100521,100522,100523,100524,100525,100526,100527,100528,100529,100530,100531,100532,100533,100534,100535,100642,100644,100646,100648,100789,100790,100791,100792,100793,100794,100795,100796,100797,100798,100799,100800,100801,100802,100803,100804,100805,100806,100807,100808,100809,100810,100811,100812,100813,100814,100815,100816,100817)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}