Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c745ecb6cdd31049b94500bbe660d62070de624af4a391a86f65d4aeab986b3' 
  AND token = 'x40hb/bhVz0b71Ku9myotDgtktkA9SjrUwdGBezKJpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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