Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f332f5b6003e7c3af1e7daa1916d3bed2aa9bbad28822a555a45dc8d9616e74d' 
  AND token = 'Pw3ukaeXo6aUfOtCJfJxNmNxR1kJJWduIeYrMW4IJE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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