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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec0018c3e52559b441f287e7269ae1238fb20456a08014fb5b4e7330c4120c4' 
  AND token = 'jDjZBTp4OmlUvQV5iGWWdSvVaNM2QXKVtsCN4wOednE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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