Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3b1be9043817b97d876f65181d167bb1bf9bfcab01aa8f242710ebb1a82668' 
  AND token = 'JB32tM5SEAfz1ihoNVOBXj+p5zVQxzPTqPW478jZQhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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