Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec88b79409a19849c6b2362f7277c5617de4c54d6203e6b28c13bc26b83744a' 
  AND token = 'MyQK5dNjZuw0OjqDGz5G2M3i4AtDb5xebHgj/G1CPV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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