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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241ce3b36f6ccbce3c730fb6390ad7d2859ba2d6bbe00528fea5b31a3c7e8623' 
  AND token = 'KbHLqNNt5prQuyAx/mOL2dnk5YVxIk03kPczc43HWPk=' 
  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"
    }
  }
}