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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ca3590978ff15cc72f857a0ee68466406e4a9f7b44bd93d1e2ae5d1072a22d' 
  AND token = '1wtX5+Ex2NfqPcAS7FQr+ENGkkbHZBPj3HvorOVsoEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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