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 (
    84257, 84258, 87575, 87576, 87590, 87591, 
    87605, 87606, 88786, 88787, 85598, 
    90826, 85578, 87656, 87670, 87677, 
    87684, 87705, 87716, 87717, 87730, 
    87731, 90022, 90024, 90038, 90040, 
    90041, 91970, 91973, 90329, 90330, 
    90331, 90333, 90334, 90337, 90338, 
    90339, 90340, 90341, 90342, 90345, 
    90346, 90347, 90348, 85590, 86358, 
    92342, 87881, 91985, 91986, 91987, 
    91988, 91989, 91990, 91991, 92241, 
    92242, 92243, 92244, 92246, 92251, 
    92483, 92484, 91969, 91971, 91972, 
    91974, 91975, 92440, 85595, 86250, 
    86810, 82557, 84045, 86354, 84775, 
    84779, 84788, 84797, 87654, 87655, 
    87668, 87669, 87675, 87676, 87682, 
    87683, 87703, 87704, 87713, 87715, 
    87727, 87729, 88692, 88693, 88739
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00156

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 (84257,84258,87575,87576,87590,87591,87605,87606,88786,88787,85598,90826,85578,87656,87670,87677,87684,87705,87716,87717,87730,87731,90022,90024,90038,90040,90041,91970,91973,90329,90330,90331,90333,90334,90337,90338,90339,90340,90341,90342,90345,90346,90347,90348,85590,86358,92342,87881,91985,91986,91987,91988,91989,91990,91991,92241,92242,92243,92244,92246,92251,92483,92484,91969,91971,91972,91974,91975,92440,85595,86250,86810,82557,84045,86354,84775,84779,84788,84797,87654,87655,87668,87669,87675,87676,87682,87683,87703,87704,87713,87715,87727,87729,88692,88693,88739)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}