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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 = 'en' 
  LEFT JOIN cscart_product_bundle_product_links as links ON bundles.bundle_id = links.bundle_id 
WHERE 
  1 
  AND links.product_id = 23529 
  AND links.show_on_product_page = 'Y' 
  AND bundles.parent_bundle_id = 0 
  AND bundles.status = 'A' 
LIMIT 
  0, 20

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}