Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5808bd0812dacbd81ff1b7e1fafe6db70f17baf19ba64ff2a212c556fe2830a' 
  AND token = 'X3yv5+bppyq3LySlQrYVPSCFWaNowxX+I/MHG+kpeSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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