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 (
    90096, 90118, 89193, 89197, 83140, 84119, 
    83118, 84115, 86815, 89973, 82364, 
    82363, 90116, 89195, 89975, 84117, 
    83138, 90123, 89202, 90117, 83145, 
    89196, 84124, 90115, 83139, 89194, 
    84116, 84118, 83137, 82390, 92840, 
    92841, 92842, 92843, 94064, 94065, 
    94066, 94076, 94077, 94078, 94079, 
    94686, 94687, 94688, 94689, 94690, 
    94691, 94692, 94693, 94710, 94711, 
    94712, 94713, 94714, 94715, 94716, 
    96302, 96303, 96711, 96712, 96713, 
    96714, 96716, 96721, 96722, 96723, 
    96725, 96728, 96729, 96730, 96731, 
    96736, 96737, 96750, 96752, 96753, 
    96754, 96755, 96767, 96768, 96769, 
    96770, 96788, 97011, 97012, 97013, 
    97014, 97018, 97019, 97020, 97021, 
    97034, 97035, 97036, 97037, 97038
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00170

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 (90096,90118,89193,89197,83140,84119,83118,84115,86815,89973,82364,82363,90116,89195,89975,84117,83138,90123,89202,90117,83145,89196,84124,90115,83139,89194,84116,84118,83137,82390,92840,92841,92842,92843,94064,94065,94066,94076,94077,94078,94079,94686,94687,94688,94689,94690,94691,94692,94693,94710,94711,94712,94713,94714,94715,94716,96302,96303,96711,96712,96713,96714,96716,96721,96722,96723,96725,96728,96729,96730,96731,96736,96737,96750,96752,96753,96754,96755,96767,96768,96769,96770,96788,97011,97012,97013,97014,97018,97019,97020,97021,97034,97035,97036,97037,97038)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}