Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3ce8612ffb16078a01643bcd025ea477d4d546c985a738f5a9adab100b56b5' 
  AND token = 'OSIaTQGCKVSjIHknN6+HDC8GBv9HVcpS9RjeEGuMivY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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