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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b72895fa8b7efcbfe9c06a643724bb1ed8d7d0cbec1fb6ef9b60acea23f76e2' 
  AND token = '7sIEXHbQHrTSE5WOhgFU6zAAZP2ejhS/Nxg5hERvMD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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