Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754e6610dfc40f66bc3b550b46fc31c3439d5c6b33e6add5fb4b6f2de9886c33' 
  AND token = 'SrjEUxNiACWSAyW2a4LH7qukUnMNE5+v2vGmPC7cMgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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