SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca638379cc75b18af06ff072cc7928bfb6a9ca44d3e4dfc54d0becacfa95de22' 
  AND token = 'Qmbdgd5iJ9/o6CN1anRz6ngAjHpFS/vMlwXtJVJ+IHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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