SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e0591963f1149838bf1b32293d8db938ab3dc6934634c9bff0b1414f3c358d' 
  AND token = 'VppYJ7cUyopfiXtBdBqLivIm+T0/ggJrI4xNahKXWfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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