Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5c4ada655a8fe321881006c10eec1fe01d1867e7e799a99e05cf514b756c41' 
  AND token = '6Pl8yH0jCtnLhpm6kNGY2GWAgD51ydFab3HZg3HAtZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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