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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0028850976d7efd41dc09e17af39f73d4e5015d6693bef123d16cdd35a9c239f' 
  AND token = '1OvFlOnmv61OOyYjCMGc7qf9dF6k95DlMbjx4+Jon44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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