SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa2a91034106d7a49fed6491351e4a7c2e105e89b6779c29058bada8e584dfd' 
  AND token = 'kMV5KMREqXzK21B/zIzOHGw2sQxJ+BUGywTw31JTmLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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