SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5548ce05f58c21ae2e66f423377cca1da443834417229f51b470b65b91765153' 
  AND token = 'h7Bj/AdYZZyyRAcKrh6GLdluvBWcvGemBzAbKypWmQE=' 
  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"
    }
  }
}