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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99fd819382c5cf5ad3c3646e9ee2d3ace40b7f93f6a9dafd5440d4cb7cd3910' 
  AND token = '5eUEptTfAjdLFynqsttswISPjGut9RZRfyudK8E64rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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