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 (
    98671, 98672, 98673, 98674, 98675, 98676, 
    98677, 98678, 98679, 98680, 99683, 
    99684, 99685, 99686, 99687, 99688, 
    99689, 99690, 99691, 99692, 99693, 
    99694, 99695, 99696, 99832, 99833, 
    99834, 99843, 99845, 99846, 99848, 
    99850, 99852, 99853, 99855, 99857, 
    99860, 99862, 99865, 99867, 99869, 
    99872, 99874, 99875, 99877, 99879, 
    99880, 99882, 99884, 99895, 99896, 
    99899, 99900, 99903, 99904, 99907, 
    99908, 99911, 99912, 99915, 99916, 
    99933, 99935, 99936, 99937, 99939, 
    99941, 99943, 99944, 99945, 99946, 
    99947, 99949, 99951, 99952, 99953, 
    99954, 99955, 99957, 99959, 99960, 
    99961, 99963, 99965, 99967, 99968, 
    99969, 99970, 99971, 99972, 99973, 
    99975, 99977, 99978, 99979, 99981
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00154

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 (98671,98672,98673,98674,98675,98676,98677,98678,98679,98680,99683,99684,99685,99686,99687,99688,99689,99690,99691,99692,99693,99694,99695,99696,99832,99833,99834,99843,99845,99846,99848,99850,99852,99853,99855,99857,99860,99862,99865,99867,99869,99872,99874,99875,99877,99879,99880,99882,99884,99895,99896,99899,99900,99903,99904,99907,99908,99911,99912,99915,99916,99933,99935,99936,99937,99939,99941,99943,99944,99945,99946,99947,99949,99951,99952,99953,99954,99955,99957,99959,99960,99961,99963,99965,99967,99968,99969,99970,99971,99972,99973,99975,99977,99978,99979,99981)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}