Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832a0ed150dff003066615f34222b0a52d7dd2da3332212f286fbac13d166ba5' 
  AND token = 'SuMsNQ+NvKc/dNJmZX9Vkb9ywFW9mjaDKancKHmJ4gM=' 
  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"
    }
  }
}