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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a987ef7ba0fe8dedb3e08db3ddca55a8a4247f2bf81191f30748176f5b307f5f' 
  AND token = 'ggXHiw30xKx8ZRgr1ZYybNEa6LQ9k7EvYtFAEZJs0zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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