Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f587c44fc8d80eda2783e47acec7226f15f973924f7c1f6d5cba2effa4b7717' 
  AND token = '3Kv3kjkts8EPv0oZxF827NBzfO67iABUPuthfMcQJPs=' 
  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"
    }
  }
}