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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191fde583c214884d6e33acc1e5cc8556cf580e9bc2b024b488604875347bb03' 
  AND token = 'Bo+cWjm9exZY7d/f82tmRKNUG77sMC4wgavxKDno41A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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