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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d53527bc5b6064bee9d77678794842b5400453336ce9fc60d1f7cd041b432ae' 
  AND token = 'xAnTkkFvh7Y/TrNvS4itLf+zPd2CEHWGEwk33340QJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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