Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3f0ab3aa5ed8372ed6e4ceaf61e088ae8a009f059380d8283a1740b36ff785' 
  AND token = 'yYeY1nqu9tEkTqRGbASmarn5dhB0GjwSzRRHUINQWNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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