SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90e0ef3055396ca3b3feacf7a748288641ed71bba0c90aca638faddf7551300' 
  AND token = 'XKqHFuWAvda1Nc/7TxVVn8Xgq/+h8PZaDh2aYIwLKmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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