SELECT 
  * 
FROM 
  cscart_product_bundles as bundles 
  LEFT JOIN cscart_product_bundle_descriptions as descriptions ON bundles.bundle_id = descriptions.bundle_id 
  AND descriptions.lang_code = 'ru' 
WHERE 
  1 = 1 
  AND bundles.display_in_promotions = 'Y' 
  AND bundles.status = 'A' 
  AND IF(
    bundles.date_from, bundles.date_from <= 1776201912, 
    1
  ) 
  AND IF(
    bundles.date_to, bundles.date_to >= 1776201912, 
    1
  ) 
GROUP BY 
  bundles.bundle_id 
ORDER BY 
  bundles.bundle_id asc

Query time 0.01400

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "bundles.bundle_id",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "bundles",
              "access_type": "ALL",
              "rows": 3,
              "filtered": 100,
              "attached_condition": "bundles.display_in_promotions = 'Y' and bundles.`status` = 'A' and if(bundles.date_from,bundles.date_from <= 1776201912,1) and if(bundles.date_to,bundles.date_to >= 1776201912,1)"
            }
          },
          {
            "table": {
              "table_name": "descriptions",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "10",
              "used_key_parts": ["bundle_id", "lang_code"],
              "ref": ["cscart.bundles.bundle_id", "const"],
              "rows": 1,
              "filtered": 100,
              "attached_condition": "trigcond(descriptions.lang_code = 'ru')"
            }
          }
        ]
      }
    }
  }
}