SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d1fce6814f7665711e7626894065d8493a15d3184c0b264aebfacb735af8d4' 
  AND token = 'FqSyzxHzDk4V6iB6fhRu+1evcw0Oome0YiwAUQ/XA7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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