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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bda7b27f83a7ff4c54c7e6f018409f49f52c678d01a777487f614f8a3662a7f' 
  AND token = 'MYhTp6kHj55PaNoKgw6dNDA2PcH2ue+f7TvkIjsC8BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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