SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4516741260f27c04a5382b66d3fc1fdb472d0fe8a6bd913155b1916925f89b' 
  AND token = 'mh46/DAoKQMwMqDmfgnWBADJfJBBxMu1kwrgX7hVunc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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