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, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    6688, 6689, 6694, 6702, 6706, 6708, 6726, 
    6725, 3103, 3097, 3113, 6687, 6699, 
    36, 37, 38, 39, 40, 41, 42, 83, 84, 85, 
    86, 87, 88, 89, 147, 148, 149, 150, 151, 
    152, 153, 168, 169, 170, 171, 172, 173, 
    174, 250, 251, 252, 253, 254, 255, 256, 
    304, 305, 306, 307, 308, 309, 3532, 3533, 
    3534, 3535, 3536, 3537, 3538, 3947, 
    3948, 3949, 3950, 3951, 3952, 3953, 
    3992, 3993, 3994, 3995, 3996, 3997, 
    3998, 4052, 4053, 4054, 4055, 4056, 
    4057, 4058, 4135, 4136, 4137, 4138, 
    4139, 4140, 4141, 4188, 4189, 4190, 
    4191, 4192, 4193, 4194
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00193

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "96.98"
    },
    "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",
      "index_condition": "((`test2_gaseus`.`cscart_product_descriptions`.`product_id` in (6688,6689,6694,6702,6706,6708,6726,6725,3103,3097,3113,6687,6699,36,37,38,39,40,41,42,83,84,85,86,87,88,89,147,148,149,150,151,152,153,168,169,170,171,172,173,174,250,251,252,253,254,255,256,304,305,306,307,308,309,3532,3533,3534,3535,3536,3537,3538,3947,3948,3949,3950,3951,3952,3953,3992,3993,3994,3995,3996,3997,3998,4052,4053,4054,4055,4056,4057,4058,4135,4136,4137,4138,4139,4140,4141,4188,4189,4190,4191,4192,4193,4194)) and (`test2_gaseus`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "87.38",
        "eval_cost": "9.60",
        "prefix_cost": "96.98",
        "data_read_per_join": "438K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text",
        "unit_name"
      ]
    }
  }
}