SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db474f0615a2662f5eb5dfe0aebf645cfda4dbde1bdc7c19860e83109ae9d1b6' 
  AND token = 'pt2XuKvC3KKbxB/BuTswItgZXeI5OG9NrzUPyGDpJ/g=' 
  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"
    }
  }
}