Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55917a8326f89b9f2938eb3ca22a76cfdb49cd78deae84e5df0ed0b984d612a4' 
  AND token = 'wIe0CiNZY4Xyeg1fKp7nlkFjl0fDzzsUA717bOanlfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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