Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2638605e2dde6ec79a76539bfeeac021e49a931b84ddbc85a36c473c4a06de2a' 
  AND token = 'XaUwaG3EFSdHR4efdCY0dmY6PnYArkfgRM8fL3PuFbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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