Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2afee139e3832692bf03da9253ef2ad813fd293e09e0d46713c81af191849f2' 
  AND token = 'OlLkjEPu9AulpO3WlEzhVc2fXuqSa7YKGqi2okf2RPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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