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 (
    101115, 101121, 101122, 101123, 101124, 
    101130, 101131, 101132, 101133, 101514, 
    101515, 101516, 101517, 101523, 101524, 
    101525, 101526, 101532, 101533, 101534, 
    101535, 101552, 101553, 101554, 101555, 
    101561, 101562, 101563, 101564, 101570, 
    101571, 101572, 101573, 101814, 101815, 
    101816, 101817, 101818, 101819, 101820, 
    101821, 101822, 101823, 101824, 101825, 
    101826, 101827, 101828, 101829, 101830, 
    101831, 101832, 101833, 101834, 101835, 
    101836, 101837, 101838, 101839, 101840, 
    101841, 101842, 101843, 101844, 101845, 
    101846, 101847, 101848, 101849, 101850, 
    101851, 101852, 101853
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00207

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "32.88"
    },
    "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": 73,
      "rows_produced_per_join": 73,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "25.58",
        "eval_cost": "7.30",
        "prefix_cost": "32.88",
        "data_read_per_join": "278K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (101115,101121,101122,101123,101124,101130,101131,101132,101133,101514,101515,101516,101517,101523,101524,101525,101526,101532,101533,101534,101535,101552,101553,101554,101555,101561,101562,101563,101564,101570,101571,101572,101573,101814,101815,101816,101817,101818,101819,101820,101821,101822,101823,101824,101825,101826,101827,101828,101829,101830,101831,101832,101833,101834,101835,101836,101837,101838,101839,101840,101841,101842,101843,101844,101845,101846,101847,101848,101849,101850,101851,101852,101853)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}