Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83134c9444ec214bbd27cd7372e7c53db9a5f4f2dc6a5c779fee0c5c49f607a' 
  AND token = 'kmwBHCMuLKW0XiV0GBWHNpkmwUXfQB5lOY3k6l6lLOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}