Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967c9e37ff0e91070a6c0df30d679d106db2a1952bb802a495abebd7e1fcbce5' 
  AND token = 'J5MWlPJNmPFNYYcUH8kBQxPqAMCBcBLBdqfZ3o3QW2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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