SELECT 
  * 
FROM 
  cscart_ult_product_descriptions 
WHERE 
  product_id = 100 
  AND company_id = 1 
  AND lang_code = 'en'

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.00"
    },
    "table": {
      "table_name": "cscart_ult_product_descriptions",
      "access_type": "const",
      "possible_keys": [
        "PRIMARY",
        "product_id",
        "company_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code",
        "company_id"
      ],
      "key_length": "13",
      "ref": [
        "const",
        "const",
        "const"
      ],
      "rows_examined_per_scan": 1,
      "rows_produced_per_join": 1,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "0.00",
        "eval_cost": "0.20",
        "prefix_cost": "0.00",
        "data_read_per_join": "3K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "company_id",
        "product",
        "shortname",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "page_title",
        "age_warning_message",
        "promo_text"
      ]
    }
  }
}