Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa363926a72bb77cd3975660a5ce302eb4f08f7bbc8a483c3078560c1bf4ed3' 
  AND token = '84DZR7VZ41HZtcKtLpJRRt+WJhNFV7NriygXwQZ9MUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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