Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d883cb7f6b8c09f8b6713c2fb1af00b91a01c903032f6066d1dea429925e4a' 
  AND token = 'eLFnMKsRlRsBjXI7byrZXx8kZsp1LW16uv3WbGnhENw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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