Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf5f53bc275e2a374b82fd5b7248df9f3faf4805a5407a26c23af53034f9614' 
  AND token = 'KZe0cGmfwT17TMQ+umRZzPGRq/eWMbsyWrLSrDO6xtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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