Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f74880fc70c3c2ffa835183f84f4f045222145c87efa3c611087b0ce09fee9' 
  AND token = 'eTxsbFmhL/ODv3sOHTsJWQ53LlJPY0Xi23+IZP1G/fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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