SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9251130d635454075f4f24b5d97f81932b5030fefc663a99dd2be6b80f7e8f' 
  AND token = '1WqKMa23XQW+YimXwiWCic+qYDJGZb9j6cfvvnjjMJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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