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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36db64f4210a95c5545408e8d76989d172ea72ae2e4d837088d36827f8a97688' 
  AND token = 'X9iXEeMbm7Ras853ubqi0jqUC+5Nxoo9XOfT6nS2U6E=' 
  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"
    }
  }
}