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 (
    82549, 92001, 91885, 91886, 91887, 92329, 
    92330, 92331, 92332, 92000, 92346, 
    91901, 91902, 91903, 92345, 92347, 
    92348, 82551, 92342, 91897, 91898, 
    91899, 92341, 92343, 92344, 88925, 
    88926, 88927, 91470, 82561, 90268, 
    91884, 90264, 91900, 90266, 90273, 
    90844, 91311, 91313, 91315, 90267, 
    90274, 85649, 85650, 85651, 82430, 
    82431, 82433, 91896, 90272, 86076, 
    86079, 86080, 90794, 90271, 90795, 
    91312, 91314, 91316, 86077, 86078, 
    90263, 90270, 90269, 90275, 90265, 
    93356, 93357, 93358, 93868, 93869, 
    93870, 93871, 94117, 94381, 94958, 
    95557, 95683, 95702, 95703, 95944, 
    96778, 96779, 96780, 96791, 96839, 
    96840, 96841, 96918, 96919, 96998, 
    98192, 98193, 98194, 98195, 98196
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00183

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 (82549,92001,91885,91886,91887,92329,92330,92331,92332,92000,92346,91901,91902,91903,92345,92347,92348,82551,92342,91897,91898,91899,92341,92343,92344,88925,88926,88927,91470,82561,90268,91884,90264,91900,90266,90273,90844,91311,91313,91315,90267,90274,85649,85650,85651,82430,82431,82433,91896,90272,86076,86079,86080,90794,90271,90795,91312,91314,91316,86077,86078,90263,90270,90269,90275,90265,93356,93357,93358,93868,93869,93870,93871,94117,94381,94958,95557,95683,95702,95703,95944,96778,96779,96780,96791,96839,96840,96841,96918,96919,96998,98192,98193,98194,98195,98196)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}