Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61aa323143603024055013efc35e98779ea0c2752cefc92014ca50657cefc08' 
  AND token = 'v31F6WWMER/zFGTxI30sxijNrCs9149l1gZmGz+mESQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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