Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c8b6183c5630fe4d4116ae2eacd321f3e6cda7de74db07017ba0424929f74f' 
  AND token = 'x+0Ey4oFe5w4hfL797FKtFaSKpTfEagl1wqrFkTnFnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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