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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed60c9bea9c788032d2bafd46a91cc2f36fc4756ceeb9bdcf69af1d65b34f4e9' 
  AND token = 'TMZLqwLYN1PTxGhFis6D3tf2PxuDlO5e3Vjlskb2E44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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