Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750ffc924f2fa1618fb47f0f8ef3f80c507a9369d4e9184c17030651947ee757' 
  AND token = 'gCpWG8RoiexfXHfELWDzyzF14gXSmUszx/M9UHQNHzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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