Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67d81a4790e0ee4a74d1eb065ad7ea8014d1b9c722b7369a0a9cbab09d067a8' 
  AND token = 'MDh6WpXDO8PZd1dUbQ+ocjae40XxjnjbCUTucvj1fAU=' 
  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"
    }
  }
}