Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7687c1895170010e74b52947ee64455371565a5bfb4268903045765b4977ab' 
  AND token = 'AqF0lJeoXJhC8JqAArIWjvfpXvFEuK16SMmLI6lL+m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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