Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd46c0b8c9345d0e0998559ef3e2f9f1e847ca58dd3a189074daedb2fc180208' 
  AND token = 'sZMUN59sOAXokg1BLO9Q2VUUICcTUjzel9cmK29V6Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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