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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3b11d9f400cc3e1ee4817025a064efd3e90772f753a17ce28d5b5ecaea59e5' 
  AND token = 'jBwh5aZGcKR7+IaoW7KtE32JN+3V9gbNWGw5EN6X52U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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