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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef6f40e0f57329dabedbc09c6332a01f87966bd9d0647e3eced5cee7745e69e' 
  AND token = '6k/4Rmyb9TQcW4BYKHbaRiS8uGIo1Ko8lTUE9IPK2ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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