Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52acb352280ff3bbec2bfe3732e07c2df7cd197521691842fa2039b60c45df33' 
  AND token = 'ArJBdvziOSyL3sX7KxHtEt5RMGQglJKkU3dFf/cHi6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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