Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4331c0ea5d20fff5eba186a2975e98b477ffd5b8c545122bef5bf58bf6bc8b' 
  AND token = 'ulnGku0hswOLgM8PTYNREY1QhIe/UVhJSyKr/e9zAM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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