SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d5f254a512b5233d8969d0acbed30fe3ba086b4b8410b17edc86e49f18d254' 
  AND token = 'lgX8TOHmLgE/Ry6jOfa+q2JOn/hxEP2vQxRyFfdZB/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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