Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747d468e4c6bd2ece35a5819adcd41841abe75f4e7234a3e0ed062135a72a130' 
  AND token = 'm5ag4aweKJUK/JiAI7xDY10t25WLfJbIts3B9GSUR1Y=' 
  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"
    }
  }
}