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 (
    89485, 90083, 86220, 83128, 84030, 84031, 
    84032, 84033, 84038, 90082, 88935, 
    89188, 89724, 88934, 83131, 90084, 
    89647, 89619, 89632, 86381, 92450, 
    92451, 92452, 92453, 92454, 92455, 
    92456, 89642, 89644, 89645, 91838, 
    90110, 90070, 89177, 92042, 92058, 
    92074, 92130, 83103, 85530, 85534, 
    84109, 90090, 90100, 83105, 84745, 
    83986, 83987, 83988, 83989, 84111, 
    90087, 90097, 88930, 90107, 91837, 
    92011, 92012, 92013, 92014, 92015, 
    92016, 92017, 92099, 92100, 92101, 
    92102, 92103, 92104, 92105, 83089, 
    84096, 83104, 84110, 90080, 83092, 
    92500, 84099, 86219, 89526, 89723, 
    90064, 89641, 91298, 83106, 91305, 
    84112, 89488, 89637, 92066, 92082, 
    83109, 83119, 85039, 91306, 91299
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00080

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 (89485,90083,86220,83128,84030,84031,84032,84033,84038,90082,88935,89188,89724,88934,83131,90084,89647,89619,89632,86381,92450,92451,92452,92453,92454,92455,92456,89642,89644,89645,91838,90110,90070,89177,92042,92058,92074,92130,83103,85530,85534,84109,90090,90100,83105,84745,83986,83987,83988,83989,84111,90087,90097,88930,90107,91837,92011,92012,92013,92014,92015,92016,92017,92099,92100,92101,92102,92103,92104,92105,83089,84096,83104,84110,90080,83092,92500,84099,86219,89526,89723,90064,89641,91298,83106,91305,84112,89488,89637,92066,92082,83109,83119,85039,91306,91299)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}