Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ba8bb5ba41d43d311fb1230cdf6b0725d49fac98c4c2f406eac00974eae453' 
  AND token = '6K/0nXjTj7SESxd7LcR/Z0DGjCC3QExuXxHSLy0HOAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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