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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cbbd38132abbe38cbfcb3f97a42c8c833417a3008f825613065bc1172730bd' 
  AND token = '5k41zIu4iYbWs6m8+0QHCZ3/fVF94xZrFgAXskseQms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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