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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd13566871427544056b5814134404ee43253a6d0a5c08f161102b22dd61fb02' 
  AND token = '8NwB7bR3AsBYyvHgm7j5XHDoWMNRKOU1fNxiaV26pvc=' 
  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"
    }
  }
}