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 (
    3618, 4080, 4081, 4082, 4083, 4084, 4085, 
    4086, 4156, 4157, 4158, 4159, 4160, 
    4161, 4162, 4209, 4210, 4211, 4212, 
    4213, 4214, 4215, 3102, 3110, 6670, 
    6685, 6698, 3095, 3101, 3108, 6683, 
    6697, 3099, 19, 20, 21, 3929, 3930, 3931, 
    6724, 3100, 3106, 3114, 3120, 3125, 
    3153, 3154, 6672, 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
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00154

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "115.60"
    },
    "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": "((`gaseus`.`cscart_product_descriptions`.`product_id` in (3618,4080,4081,4082,4083,4084,4085,4086,4156,4157,4158,4159,4160,4161,4162,4209,4210,4211,4212,4213,4214,4215,3102,3110,6670,6685,6698,3095,3101,3108,6683,6697,3099,19,20,21,3929,3930,3931,6724,3100,3106,3114,3120,3125,3153,3154,6672,6688,6689,6694,6702,6706,6708,6726,6725,3103,3097,3113,6687,6699,36,37,38,39,40,41,42,83,84,85,86,87,88,89,147,148,149,150,151,152,153,168,169,170,171,172,173,174,250,251,252,253,254,255,256)) and (`gaseus`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "106.01",
        "eval_cost": "9.60",
        "prefix_cost": "115.61",
        "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"
      ]
    }
  }
}