Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8362eb39a6a64b2f1d40a13e6d46b1bd248c70754f8fc50ab4599fc2d37cc1' 
  AND token = 'Geg7CT7UWhFAR11oaCVx5siP7Q7Wbr+Ct72XauIi6xo=' 
  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"
    }
  }
}