Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255f9e9cfefe85ddd131bd90ec7f07bc0435f9aa4f6a8b1c6727ffc5e0964eb5' 
  AND token = '5lwE7RCe3NHukkWt6+TfTpGqixCnxotSM3uMP9PNpAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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