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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b34833c8a4432219dab617997fc70bb3af1f5e4e014a25e6aba69e1346d03a3' 
  AND token = 'ybVvtt/IASXYU548YU5PBlRiC5w9wI49pa7JhBWn80M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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