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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482be6e2bb23e9330fd9d0d073e2493c76e8a75fdc6d65a9bc1328a1ffc0459e' 
  AND token = 'dj7ndyUU+Piwia2MQeiPxB+HHxBQYmfQ9ux11wQWWpY=' 
  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"
    }
  }
}