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 (
    83999, 84001, 84003, 84005, 92051, 92052, 
    92053, 92054, 92055, 92056, 92057, 
    89643, 83998, 84000, 84002, 84004, 
    84034, 89617, 89630, 83955, 83957, 
    83959, 83961, 92139, 92140, 92141, 
    92142, 92143, 92144, 92145, 84026, 
    84027, 84028, 84029, 89626, 89639, 
    89652, 89523, 91308, 92050, 92138, 
    83954, 83956, 83958, 83960, 90061, 
    89623, 89636, 90106, 89649, 91304, 
    83982, 83983, 83984, 83985, 89187, 
    90081, 89485, 83128, 89619, 89632, 
    89645, 83103, 85530, 84109, 83986, 
    83987, 83988, 83989, 90087, 90097, 
    92011, 92012, 92013, 92014, 92015, 
    92016, 92017, 92099, 92100, 92101, 
    92102, 92103, 92104, 92105, 86219, 
    89723, 83109, 83119, 91299, 90069, 
    83091, 91310, 86387, 84098, 91309
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00236

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 (83999,84001,84003,84005,92051,92052,92053,92054,92055,92056,92057,89643,83998,84000,84002,84004,84034,89617,89630,83955,83957,83959,83961,92139,92140,92141,92142,92143,92144,92145,84026,84027,84028,84029,89626,89639,89652,89523,91308,92050,92138,83954,83956,83958,83960,90061,89623,89636,90106,89649,91304,83982,83983,83984,83985,89187,90081,89485,83128,89619,89632,89645,83103,85530,84109,83986,83987,83988,83989,90087,90097,92011,92012,92013,92014,92015,92016,92017,92099,92100,92101,92102,92103,92104,92105,86219,89723,83109,83119,91299,90069,83091,91310,86387,84098,91309)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}