SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b544367625f95aa10fe7d8144ec9cb6ed83af66c105f84767d44d12ea7c0d60' 
  AND token = 'zGR/rYhJbzsWXv5a+Xwzs5ucGBfzlijJiKAReEKKo7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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