Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c99add9a18c5a74cd69af77e5ed017bbc955db792dae6b7aa409161b85753a8' 
  AND token = 'dHWQ5nzaS/UxLIooa/IhN5yBfPcBNL/sFjJm/9yVY+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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