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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9ebc54bec760a347d1370b027ac955c617db434ad0ee483eca8231941e41d0' 
  AND token = '4X6aNHPbWWRi2eY+lN5dxq+wGUe/G07GZHRW5GxZN/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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