Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d04892b974da51b4d35b9370e083be63cce59ce8fa3dcca0ae6d64eddbf9ed' 
  AND token = 'iTgqLq/thZ6b/EBaOCyPelCSjV7FK4D1SOlyaMsusH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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