SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1924714e706397574ef107318d9cce475fa79b95336e66865cc28dfce39d2c3e' 
  AND token = 'Qkg7B6yzavQadFCYF8WGZ3F5w+qAU/LW0sz8pRX2Y/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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