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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114934a75571210afae06100d41706660a7d7d350aa379784d2a6af48146686f' 
  AND token = 'SaybEhfN9yZOF4orQBBvIy6VKZkgUpZcvd27muzyj8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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