Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f43bcf17de281034e5a1b85372cc19a1dc4b9dacc47d76fcd7de20f9d27fa3' 
  AND token = 'ryxpQ+dx8cvlA3XDDdAPUgI7IWnvItU95IHqgqTW+ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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