Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c11c7266a04b3e1e1989125102abcd1a5987dcbb8c0ea3876f77538a2c35517' 
  AND token = '9cq2viRBHPlJfUuCTIwxfya8ZGUHvtCq+QXkQWReNok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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