Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2670dc349a5a4ea218034f2546ef72a5f39588006979fe33d86d3599a1eef11' 
  AND token = 'MRrLN1/rntj5pYQ//yIZac7FI7YbKWggCCSUeWA/Qjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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