SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea03b890fc8962ada83f0c791440ddfca90ef3076624a5242759556c0bceb6cc' 
  AND token = 'HhG0ZOiQy2u9Rf+zUBDVHjPFaxuPJxYr5CLVPxgzDxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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