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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd557f63320955bd4dbdc8b8d9e368dbc7be2556fc8abb118f36a4dcbbba3f228' 
  AND token = '/1xHwUJWO8iYlDqJopptUfGqZo3Dfb3YJYuQknftyKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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