SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8693055c1e1fc39fe41f627d181d8223dd7bf958a8c4f5e12997cbf7010232b6' 
  AND token = 'VPizDMXWK+J5oMvCpfeDvvV6kZPUAlQkLQEKR4babjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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