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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df4028a8f6491071f5022ff3d8559768d5d9d0fcfce6259799120e288cdd29f' 
  AND token = 'uuA95oqpeRegojUxuSQqrJESN838l4N/4Pvxtxz722c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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