Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bbf2c26ff9c4bf5778aecdc6e5b9345d4cca98acb57db092c0d836ba91adfe' 
  AND token = 'D1gYyxfMfveiATRUHUZO8apvKvHnUuQfZOp165Op9cI=' 
  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"
    }
  }
}