Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cfdcc14916fc94a416fe19fc9871f48561ffca530d194f80fcd5db8588a21f' 
  AND token = 'syA264xwkERw+QsWvtuo6/keBMDlXh39qtpDDHnNYCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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