Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015bded28714096d632f9f2a4ff14c90b45c259453ac9a96c065c0595113e8db' 
  AND token = 'kYHcuA6R1yrm7OfB9n0ZRapdVLMMJOHypE7XfnNG6QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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