Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50296bec0b7f7196ca30f5135dcfe1f67b207163457608cc9b8b96f86e90f638' 
  AND token = 'Fu5SOaNzAcNns4fFLot4jV50kJaCxrKeKhwCVXChH48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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