Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e716d50d776bd4ac2582df40563ee050df826b2e976b728907d737e389bfa44b' 
  AND token = 'YDnIwCvYmm6DxSrIyCtM+h4xaM2PhR3H0Pyw0+l9uTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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