Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9d425d6c0bf9be22136af49e998b204581c0660f67f012a97d7f6dd62dcbff' 
  AND token = 'y7D8OcAUMjvrpyVUrtc5AOvujHgtfr3Q3zulSflVpKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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