Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bd055a517b581ad78c4b03436540ce260d2ce21d6b4aea5c70bf2a7860a8f8' 
  AND token = 'kP80qN5+Wixnn70SCsPGiIcznbSKUQJEYlxcO2cWYSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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