Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf77753c1b98404e8cc6fce8a183bb34d89d032e882a3358971ce75a3044f39' 
  AND token = 'c7cvVUUvXYacDj7Pxv9PVb73be8sKy5hsuFD4GupHng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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