Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e902e2d9e77f5253a295af49649da64c74f99243d6e2d8548e4195a191e8bce' 
  AND token = 'ZD/QwpCIJpNzuJzVAlIORFFsxNyX0gneDCNnyi+egG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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