Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73482301d909c3e0b6f27ee2bafd0464df3c199942afcde016fb842ae0d3c2b' 
  AND token = '0pbxl48qOouGk7Lj3Dl9MshLL3yhLJBSBzIOgrPneNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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