Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc8609645aed5cb64a8a84d39e020998436932c438a343a3aa4ec245ce0a9a7' 
  AND token = 'V6Ss6dXNYFbIRS2IZ4WmcfQJKuhY15zBiuYi7rO/KKE=' 
  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"
    }
  }
}