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 (
    100927, 100930, 100931, 100932, 100933, 
    100934, 100935, 100936, 100937, 100938, 
    100939, 100940, 100941, 100942, 100943, 
    100946, 100947, 100949, 100950, 100951, 
    100952, 100953, 100954, 100955, 100956, 
    100957, 100958, 100959, 100960, 100961, 
    100962, 100963, 100964, 100965, 100966, 
    100967, 100968, 100969, 100970, 100971, 
    100972, 100973, 100974, 100975, 100976, 
    100977, 100978, 100982, 100983, 100984, 
    100985, 100986, 100987, 100988, 100989, 
    100990, 100991, 100992, 100993, 100994, 
    100995, 100996, 100997, 100998, 100999, 
    101000, 101001, 101002, 101003, 101004, 
    101005, 101006, 101007, 101008, 101009, 
    101010, 101093, 101094, 101095, 101096, 
    101097, 101098, 101099, 101100, 101101, 
    101102, 101103, 101104, 101628, 101629, 
    101630, 101631, 101632, 101633, 101678, 
    101679
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00173

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 (100927,100930,100931,100932,100933,100934,100935,100936,100937,100938,100939,100940,100941,100942,100943,100946,100947,100949,100950,100951,100952,100953,100954,100955,100956,100957,100958,100959,100960,100961,100962,100963,100964,100965,100966,100967,100968,100969,100970,100971,100972,100973,100974,100975,100976,100977,100978,100982,100983,100984,100985,100986,100987,100988,100989,100990,100991,100992,100993,100994,100995,100996,100997,100998,100999,101000,101001,101002,101003,101004,101005,101006,101007,101008,101009,101010,101093,101094,101095,101096,101097,101098,101099,101100,101101,101102,101103,101104,101628,101629,101630,101631,101632,101633,101678,101679)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}