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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b59fdcaafdb6d90e11de1ad805c2b0fc8ab9b257d5dbdcaf1e0c2e011cedb92' 
  AND token = 'KiLBXl4Ccj7eqOIcwJYLzNumVWxC11xouXY1ZLGv1lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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