SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d28333fe7ccc29bb6a1e945b317c61ead3b44258c8f8fd0243a831425892d26' 
  AND token = '5E0YX+sze/nWZGYEPvWMVfQbwu9yW8JrKWNKhIqYCuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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