Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2541283800f6e8c5346773aab8aa944a8e412809a6db68ebe8d2877c8da58ba' 
  AND token = 'oK63Kz65W5qPSJqmWkDXXPzWdgks4MsfiCqzd/WQEig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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