Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a36ce432abfd4ebbaf779827a01ccef0a61b08fe52652a36b3c701a658477a' 
  AND token = 'Eo7tWEMK5P9yKpFCcer6WtQ+ZxjiAMpdovg1fA6DIQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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