Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6f9f4000568e17d967a70109c7ca461a21c58c8298f21d6d409b627189b8c6' 
  AND token = '8KpIQPeFEj7gwD4Gdlm+VmLdWWQg3okwiqnmBkk+AUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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