SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5675ed9accf689246684dc7cb4f4237a648586783590dbdda6fe7fa8695b23' 
  AND token = 'SWglQvRPqaneqeRcWjXyK+9SgywMQYskB3TL6GYIMcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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