Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca68e158d6a59913e053941a7e5c1138c46cbdab93b47bd2f25de8f3ffc342f3' 
  AND token = 'IY+HLnJnjePc8V+v7AbiufnW+JtZ9c0T/i4qdqD2hWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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