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 (
    3095, 3101, 3108, 6683, 6697, 3099, 19, 
    20, 21, 3929, 3930, 3931, 3414, 6938, 
    6941, 6944, 3412, 6937, 6939, 6943, 
    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
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00074

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "57.81"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "index_condition": "((`gaseus`.`cscart_product_descriptions`.`product_id` in (3095,3101,3108,6683,6697,3099,19,20,21,3929,3930,3931,3414,6938,6941,6944,3412,6937,6939,6943,6724,3100,3106,3114,3120,3125,3153,3154,6672,6688,6689,6694,6702,6706,6708,6726,6725,3103,3097,3113,6687,6699,36,37,38,39,40,41)) and (`gaseus`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "53.01",
        "eval_cost": "4.80",
        "prefix_cost": "57.81",
        "data_read_per_join": "219K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text",
        "unit_name"
      ]
    }
  }
}