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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34d6faf186987e385582685df32bc183fcbb6f163e326744b698338245b6fc0' 
  AND token = '3G+EROMaJpp8mPSEs3qBvy9gq+b3sdY3AkDoY0EjI6g=' 
  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"
    }
  }
}