Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c8a9cd86bbf75b7eb7f0459cfaf6dd082885b0159a218460b3588afba026df' 
  AND token = 'i0ETlRf6Vc8HfWdD7URQZvGZ/lFSiYkHHSipV4YNMgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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