Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4740c9722e6352e593062a9cd5cc87c00787fad518f30676cbe30ff1e73cb2' 
  AND token = '4Z45/nUOvHT24KNVnhIPPg46Ny/2Ed2ucaDpZEUjq04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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