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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b129b540813326ad211a90db9bd87df09c05410274ee842039834985ae9b1ebb' 
  AND token = '/WsnnmivnxiWUgLqtcfoDblpUOve4DMHcG99fK+P4pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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