Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb73116ccf48edc9f405f33a8e21a9f9eb9921ef225db90f412369fd90ae922f' 
  AND token = 'nUwndF8KAFxhlo0mYBCCFjW272MlTbCKo7bzndVbFOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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